Piston-ring expander and remover



x LMQZZS.

Dec. 26, 1922.

P. O. MAMOCK.

PISTON RING EXPANDER AND REMOVER.

FILED NOV, 12, 1921.

1 E3 nva 44104,

U rhdfl FEAIZZOCK, 0F RASPEBUBG, LPKABYLAND.

ZEISTODLEING EXPANDEP, AND BEMOVER.

T 0 aZZ whom it may concern:

Be it known that 1, PAUL 0. MAMooK, a citizen of the United .States, residing at Raspeburg, in the county of Baltimore and State of Maryland, have invented certain new and useful Improvements in Pistonliing Expanders and Removers, which the following is a specification, reference being had to the accompanying drawings.

fit is a purpose of the present inventionto provide a device of this kind capable of e:-: panding and removing piston rings of various diameters.

Another purpose consists in the provision of a piston ring expander and remover wherein a pair of opposed members is provided having arms so shaped to engage about the ring and including clamps or jaws upon the arms adjustable so as to engage with piston rings of different diameters, whereby a pair of pins carried by the terminals of the arms may engage the notches in the piston ring for expanding it suthto remove it "from the piston.

While the design construction at pres ent illustrated and set forth are deemed preferable,-it is obvious that as a result of a reduction of the invention to amore practical form forcommercial purposes, the invention may be susceptible of changes, and the right to these changes is claimed, provided they are comprehended within the scope of what is claimed.

The invention comprises "further features and combination of parts, as will be-hereinafter set, forth, shown in the drawings and claimed.

In the drawings:

Figure l is a view in elevation showing the improved piston ring expander and reinover constructed in accordance with the invention, showing the opposed members or jaws thereof as having been moved, in doted lines; Y

Figure 2 is a view in elevation of the piston ring expander and remover, showing the clamps as having been adjusted to en-- a piston ring of a smaller diameter.

Figure 3 is a plan view of the adjacent end portions of the two jaws of the opposed members, showing the pins engaging with the notches at the ends of the piston ring;

Figure 4 is a sectional View on line 4-4 of Figure 1; and "Figure 5 is a detail View of one of the members, showing how a connecting bar between the inembers engages through the slot in the handle of one o1 the members.

Referring to the drawings, 1 and 2 designate the opposed members of the ring expander and remover. Each member comprises handle portion 3 terminating in a part 4 extending at obtuse angle to the handle portion. The part a merges into an extension 5 which extends substantially at right angles to the part l. The extension 5 terminates in the curved portion 6. The opposed meinbers l and 2 are arranged relatively to each other so that the terminals 1" the curved portions 6 abut, there being a bar or plate 7 passing through slots 8 adja cent where the handles merge into the portions 4. Suitable cotter pins 9 engage through openings 10 adjacent the ends of the bar or plate 7 to limit the outward movement of the handle. A coil spring 11 surrounds the bar 7 and is adapted to expand sui'iiciently to hold the handles against the, cotter pins.

The adjacent terminals or" the curved portions 6 have transversely disposed pins 1-3. It will be noted that these pins are in alignment, that is when the terminals 12 are in alignment. However, when the opposed members are expanded or moved apart and engaged about the ring, the terminals are sprung slightly laterally from each other, so

that the pins 13 may engage the not hes 1% of the adjacent ends of the piston ring. This may be accomplished bycausing one pin 13 to first engage one of the notches, then the other terminal is moved in the opposite direction to cause the other pin 13 to engage the opposite notch 14:. T his is accomplished when the opposed members are engaged in position about the piston. Upon pressing the handles ofthe opposed members toward each other against the action of the coil spring 11, the opposed members will mainly fulcrinn at points substantially 1.5 degrees below an imaginary center line of the piston ring, say 'l'or'instance about 15 degrees below the line c c. Although this is about the true fulcruming point for the opposed members, they also have a fulcruming artion upon the bar 7. The tnlcruniing action on t 1e bar 7 is not a fixed fulcrum, but due to the bar loosely engaging through the handles, the fulcrums are changeable or variable. When the terminals of the curved portions 6 of the arms separate sufficiently, the adjacent ends of the piston ring will be likewise separated,

the ring may be expanded far enough so that it will be lifted easily over the piston. After the ring is disengaged from the piston it may be detached from the pins 13 and placed to one side. Each piston ring may be removed in a similar manner.

Piston ring abutments 15 are mounted upon the portions 5 of the arms of the op posed members and are adapted to engage with the piston ring at points-fifteen degrees below an imaginary line passing horizontally across the diameter of the piston ring, as indicated by the line a'a in Figure 1. These abutments act to prevent the terminals of the piston ring from disengaging the pins 13 when the arms are separated sufliciently to open the ends of the ring. Each abutment comprises a pair of opposed plates 16 constructed of any suitable material, preferably sheet metal, clamped together by means of a screw bolt 17 and nut 18. The plates 16 have arms 19 which engage the opposed edges of the portion 5 of one of the opposed members, as shown clearly in Figure 4. Obviously by tightening up the nut 18, the 0pposed plates 16 may be drawn together securely to hold the abutments in different positions upon the portion 5. The other ends of the plates 16 terminate in arms 20 which are of angular contour-adapted to engage the opposite edges of the piston ring, particularly when the diametrically opposed portions of the ring are being expanded. lhe right angled disposed terminals of the arms 20 ot the plates 16 act to prevent lateral movement of the piston ring, during its expanding movement, whenthe opposed members are in the act of separating the terminals of the ring. Obviously the abutments may be adjusted along the portions 5 of the arms of the opposed members, so that the right angled arms 20 may engage piston rings. of different'diameters. In fact, the arms or portions 20 have their flanged portions extending at obtuse angles to the portions 5 of the arms of the opposed members 1 and 2, so that the portions 20 may engage the piston ring at points substantially fifteen degrees below an imaginary horizontal line, as indicated at (re-'0. in Figure 1., so as not only to prevent lateral mmeinent oil the piston ring but also to prevent movement of the ring in a direction toward the handles.

To engage the piston ring expander with the ring, it is held in one hand with the handles as far apart as the cotter pins 9 will al low. The device is then slipped over the piston and the pins .13 are engaged in the notches 12 of the adjacent ends, ol the ring.

tlhe handles are then pressed together until 7 the ring has expanded enough to be slipped over the piston. While the opposed handles in a sense have changeable fulcrums on the bar 7, the sole purpose of the bar 7 is to unite the opposed members so as to construct the device as one unit. It may be noted that the opposed members may act as well Without the bar 7 and the spring, and it it is posterminalsot the arms being curved and normally abutting and provided. with means for engagement with the diagonally disposed notches of the piston ring whereby, upon a separating movement'of the terminals of the arms, the ends of the piston ring may become separated, and means upon the arms adapted to engage the piston ring points substantially fifteen degrees below an' imaginary horizontal line passing through the axis of the piston ring, thereby preventing the notched terminals of the ring from disengaging the ring engaging means on said arms.

2. In a piston ring expander and remover, a pair of opposed members having jaws for engaging opposite portions of a piston ring,

't'ulcrumed connecting means for the members, the jaws having opposed terminals pro vided with means for engagement with diagonally opposed notches ot' the piston ring for separating the ends of the ring, and abutment means adjustable onthe jaws and adapted to engage piston rings ofdifi'erent diameters at pointsbelow an imaginary horizontal line passing through the axis of the ring to prevent disengagement of the notched terminals of the ring from the notch-engaging means of the jaws.

3. A. piston ring expander andv remover comprising a pair of opposed jaws adapted for engagement with opposed parts of a piston ring, means for operatively connecting said jaws, said jaws having adjacent terminals, means carried thereby for engagement with the notches at the terminals of the piston, ring for expanding the piston ring tern'iinals, and meanson the to prevent the piston. ring terminals from disengaging the notch. engaging means. M

4;. A. piston ring expander and remover comprising opposed operatively connected jaws adapted to engage opposedparts of a piston rm abutment means ad ustable upon the jaws and provided with means to embrace a piston ring at points below a horizontal'linepassing through the axis of the .ring, said'jaws adjacent their terminals being provlded with means to engage the ter minals of the piston rings, thereby cooperating with the abutment means for expanding and removing the piston ring.

5! A piston ring GXIWJJUlGl and remover comprising a pair of opposed jaws having terminals adapted for engagement with 0pposed parts of a. piston ring for expanding the piston ring, means for operatively yieldingly connecting said jaws, and means on the jaws to prevent the opposed parts of the piston ring from disengaging the terminals of the aws.

6. A piston ring expander and remover comprisingopposed operatively connected jaws having terminals adapted to engage opposed parts of a piston ring abutment means adjustable upon the jaws and adapted to engage a piston ring at points below an imaginary horizontal line passing through the axis of the ring, thereby cooperating with the jaw terminals in expanding and removing the piston rin 7. In a piston ring expander and remover, a pair of opposed members having jaws provided with means for engagement with the opposed parts of the piston ring for separating the ends of the ring, and means operatively connecting the members, abutment an i.

niea us adjustabl on the aws adapted to sin gage the piston ring at points below an imaginary horizontal line passing through the axis of the ring to prevent the opposed parts of the ring dissengaging the ring-engaging means oi? the jaws.

8. In a piston ring expander and remover, a pair of opposed members having arms adapted to embrace a piston ring the ter minals of the arms bein curved and provided with means for engagement With the piston ring, whereby upon a separating movement of the terminals of: the arms the ends of the piston ring are separated a yieldahle connection between the members, and means npon the arms adapted to engage the piston ring at points below an imaginary horizontal line passing through the axis of the piston ring, th rebypreventing the ring from disengaging the ring engaging means on sald arms.

- In testimony whereof I hereunto affix my signature.

PAUL O. MAMOCIL 

